hat yai is not even 1% of Chiang Mai, it's country side and 90% Muslim dominated in food, culture, nightlife, fashion. If you like Chiang Mai, you won't like hat yai
Good luck to pay and then you do not full fill the requirement. There are no clear info about employer, freelancer, aso.
So you get a 5 year visa if you attend a cooking class, a Muay Thai camp, a seminar or a music festival ? Nobody will believe this. A medical treatment like a date for a breast operation and you get a 5 year visa? Try, pay and you will see the answer.
And I will start to organise Seminars and I become a billionaire